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Amino-acid and water molecules adsorbed on water clusters in a beam

J. Chem. Phys. 123, 074301 (2005); doi:10.1063/1.1999587

Published 19 August 2005

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Ramiro Moro, Roman Rabinovitch, and Vitaly V. Kresin
Department of Physics and Astronomy, University of Southern California, Los Angeles, California 90089-0484
Water clusters (H2O)n and (D2O)n (n<=15) are produced by supersonic expansion and then pick up an additional heavy or light water molecule, respectively, or an amino-acid molecule (glycine or tryptophan). The products are analyzed by electron bombardment ionization mass spectrometry. Ionization proceeds via the well-known loss of an OH or OD group, but these turn out to have a strong predilection to come from the guest, rather than the host, molecule: between 30% and 60% of the time the loss originates in the picked-up molecule, even for large n. In fact, the magnitude of this fraction depends on the guest, but is largely insensitive to the cluster size. The observations suggest that the host clusters are frozen into compact annealed shapes, and the adducts reside on the surface and form an inhomogeneity where dissociative ionization tends to localize. It is also notable that no significant amino-acid fragmentation is observed beyond the hydroxyl group loss, in contrast to other measurements employing electron-impact ionization. ©2005 American Institute of Physics
History: Received 4 May 2005; accepted 22 June 2005; published 19 August 2005
Permalink: http://link.aip.org/link/?JCPSA6/123/074301/1
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KEYWORDS and PACS

Keywords
PACS
  • 36.40.Jn
    Reactivity of atomic and molecular clusters
  • 68.43.Hn
    Structure of assemblies of adsorbates (two- and three-dimensional clustering)
  • 68.43.Mn
    Adsorption/desorption kinetics
  • 33.15.Ta
    Molecular mass spectra
  • 34.80.Gs
    Molecular excitation and ionization by electron impact
  • YEAR: 2005

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PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
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REFERENCES (32)
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